I did notice at the beginning of the video that the gain was dimed on both pots. In this case, like many amps with bright switches, the bright caps are electronically bypassed/out of circuit. Add the fact the these amps have linear taper gain pots, the gain is more like a bright control than a gain control. Dropping the gain pots to between 11:00-12:00 will retain the same level of gain but significantly tighten the amp when using the bright switches. In this area, the bright switches have the most effect.